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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of pedogenetic processes on the validity of kaolinite crystallinity indices: A case study of an Amazonian Ferralsol-Podzol soil system with white kaolin

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Author(s):
Ishida, Debora Ayumi [1] ; Vieira-Coelho, Antonio Carlos [2] ; Melfi, Adolpho Jose [1] ; Lucas, Yves [3] ; Brasiliano Camargo, Joao Paulo [4] ; Montes, Celia Regina [5]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, IEE, Nucleo Pesquisa Geoquim & Geofis Litosfera, NUPEGEL USP, Av Prof Luciano Gualberto 1289, BR-05508010 Sao Paulo - Brazil
[2] Univ Sao Paulo, EP, Dept Engn Met & Mat, NUPEGEL USP, Av Prof Mello Moraes 2463, BR-05508900 Sao Paulo - Brazil
[3] Univ Toulon & Var, BP20132, F-83957 La Garde - France
[4] Univ Sao Paulo, NUPEGEL USP, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[5] Univ Sao Paulo, NUPEGEL USP, CENA, Av Centenario 303, BR-13416903 Piracicaba, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: APPLIED CLAY SCIENCE; v. 162, p. 435-442, SEP 15 2018.
Web of Science Citations: 0
Abstract

Structural defects of kaolinite could be associated with its genetic (weathering, pedogenetic, and hydrothermal) processes. Kaolinite crystallinity indices were evaluated in the context of pedogenetic processes associated with a representative Amazonian Ferralsol-Podzol soil system. This soil system, which is comprised of various types of kaolinitic materials and has a soil dynamics characterized by the progressive replacement of Ferralsols by Podzols, has been evaluated by Hinckley (HI), Aparicio-Galan-Ferrell (AGFI), Lietard (R2), and Amigo (A(001)) ``crystallinity indices{''} and the ``expert system{''} of Plancon and Zacharie (PZ). The results indicate that the complexity of the kaolinite population, which is due to pedogenetic processes, makes it difficult to interpret the usual kaolinite crystallinity indices. In areas where kaolinites are formed under low aggressive conditions (higher pH and lower dissolved organic carbon, DOC) and in equilibrium with the soil solutions, low-defect phase becomes dominant and there is a good consistency between the ``crystallinities{''} provided by each index. However, in areas where kaolinites are formed under highly aggressive conditions (lower pH and higher DOC), the proportion of low-defect phase decreases. This induces changes in the values of the indices, which do not have the same weight from one index to another. (AU)

FAPESP's process: 11/03250-2 - Quantification and dynamics of carbon associated with deep spodic horizons of Amazon Forest soils, towards possible climatic changed
Grantee:Célia Regina Montes
Support Opportunities: Regular Research Grants
FAPESP's process: 12/51469-6 - Modelling the dynamics of equatorial forest soil deep carbon in changing environments - C-PROFOR
Grantee:Adolpho José Melfi
Support Opportunities: Research Projects - Thematic Grants